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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773219f9be899a7e50fc3df94a640d13617a8a51e01b78fa8d46d8156c63e6a3' 
  AND token = 'fmkdH6IBF2JmRqvV0aXPbt5WRscvTe89e/V5GcB9NUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}